S_Monochrome

Generates a monochrome version of the source clip using adjustable weights
for the red, green, and blue channels. This can simulate the use of a
color filter applied to the lens of a black and white camera. For example,
use more red weight to darken blue sky areas of the input. The weights are
scaled so they sum to 1 before being used to reduce overall brightness
changes when they are adjusted.

In the Sapphire Adjust effects submenu.

Inputs:

Source: The current layer. The clip to be processed.

Parameters:

Weight Red: Default: 0.3, Range: -1 to 1.
The relative contribution of the source's red channel.
To simulate a black and white exposure using a red filter, set this
to 1 and set the green and blue weights to 0.